<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>1-Promise基本语法</title>
</head>

<body>
    <script>
        //实例化 Promise 对象
        const p = new Promise(function (resolve, reject) {
            setTimeout(function () {
                //
                // let data = '数据库中的用户数据';
                // //resolve
                // resolve(data)
                let err = '数据读取失败';
                reject(err);
            }, 1000)
        }
        );

        //调用promise 对象的 then 方法
        p.then(function (value) {
            console.log(value)

        }, function (reason) {
            console.error(reason)

        })
    </script>
</body>

</html>